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It was heard in the Bogside at around midnight on Thursday. A PSNI helicopter was launched amid extensive police checks in the area. Nothing has been found and the cause of the bang is not yet known. A police spokesperson said: "Police in Derry received a number of reports of a loud bang in the city at around midnight on Thursday 25 April. "Extensive police checks were carried out in the area by officers on the ground and the police helicopter but nothing was found.
This is not Derry’s first ‘big bang’ mystery. On 12 January last year, UTV reported details of a security alert after a blast was heard. At the time, police said they exhausted all lines of enquiry but the cause of the ‘explosion’ remained unclear.